A polymer is nothing but a repeating unit of a monomer that joins together to form a larger compound. It involves two reaction processes condensation and addition. When two or more single units are combined to form a polymer then that process is known as polymerization. This topic is best described in the Synthetic Polymers Homework Help.
Synthetic polymers are commonly known as plastics but the word comes from the Greek meaning “plasticos”. Plastic refers to those materials which can be easily molded into various shapes. For example, polyethylene is formed from n number of ethene units. Polymers that have an organized structure are called stereo regulars.
Polypropylene (-CH2-CH2- CH3-)n
Characteristics of polymers:
1) Synthetic polymers are generally low density molecules with low coefficient of friction.
2) It can be molded very easily and is corrosion resistant.
3) Not too expensive. Anyone can afford it.
4) Low mechanical strength compared to other molecules like iron, glass.
5) It cannot tolerate very high temperature because its melting point is very low.
6) It can be made of different colors and shapes.
7) Gives the finished product a nice glossy surface.
8) It has very low tensile strength.
Classification of Polymers:
It is divided into two main categories: one is dependent on linkage moieties and the other is based on the physical properties associated with heating. Those who have difficulty in studying organic chemistry can go through the synthetic polymer homework help.
i) Based on linking molecules:
a) Homopolymer: Polymers are composed of identical repeating groups having similar linkages. An example is polyethylene.
b) Copolymer: Polymer consisting of two or more different types of monomer units with different patterns of linkage.
ii) On the basis of physical property related to heating:
a) Thermoset: This includes plastic which can be molded into any shape as it becomes soft after heating. But once it cools down its shape remains the same until it is heated again. Bakelite is one such example and is used to make pans, dishes and pot handles.
b) Thermoplastics: Plastics which soften easily on heating and become firm on heating. These are the most popular of all.
Chemistry of Synthetic Polymers:
a) The polymer becomes stronger as the chain length increases. This means that the chain length is directly proportional to the strength of a polymer.
b) If the substituent attached to the molecule is polar, it will link between other molecules to form a polymer with high tensile strength.
c) Straight chain compounds produce crystalline molecules that have good strength rather than branching because they can pack more closely which are difficult to break.
D) If monomers are joined by covalent bonds then they will be difficult to soften.
e) The longer the chain, the more entangled it is due to the intermolecular forces present between the polymers.
f) In a straight-chain polymer, there is more area to contact, and therefore a crystalline structure is produced that is less flexible.
g) A neck is formed when the polymer is cold-stretched which further lines up to form a closely packed structure with greater stability.
In a crystalline structure, the methyl group has the same orientation along the chain, so it is called an isotactic form, whereas in the amorphous structure the methyl group is randomly arranged along the chain, hence the name atactic forms. has given. Chemistry is the valuable concept behind synthetic polymers when working on chemistry projects and the student may find it difficult to wrap it up but all the solutions are available on the synthetic polymer assignment help.